Depto de Química, Universidade Federal de Lavras, Lavras-MG, Brazil.
Water Sci Technol. 2011;64(10):2059-65. doi: 10.2166/wst.2011.786.
The present work highlights the preparation of activated carbons (ACs) using spent coffee grounds, an agricultural residue, as carbon precursor and two different activating agents: water vapor (ACW) and K(2)CO(3) (ACK). These ACs presented the microporous nature and high surface area (620-950 m(2) g(-1)). The carbons, as well as a commercial activated carbon (CAC) used as reference, were evaluated as phenol adsorbent showing high adsorption capacity (≈150 mg g(-1)). The investigation of the pH solution in the phenol adsorption was also performed. The different activating agents led to AC with distinct morphological properties, surface area and chemical composition, although similar phenol adsorption capacity was verified for both prepared carbons. The production of activated carbons from spent coffee grounds resulted in promising adsorbents for phenol removal while giving a noble destination to the residue.
本工作利用咖啡渣（一种农业废弃物）作为碳前驱体，并使用水蒸气（ACW）和 K(2)CO(3)（ACK）两种不同的活化剂，制备了活性炭（ACs）。这些活性炭具有微孔性质和高比表面积（620-950 m(2) g(-1))。所制备的活性炭以及用作参比的商业活性炭（CAC）被评估为酚类吸附剂，表现出高吸附容量（≈150 mg g(-1))。还研究了酚吸附中溶液 pH 值的影响。不同的活化剂导致活性炭具有不同的形态特性、比表面积和化学组成，尽管两种制备的碳都验证了相似的酚吸附容量。利用咖啡渣生产活性炭是一种很有前途的酚类去除吸附剂，同时也为这种废弃物提供了一个有价值的归宿。
